73K224L-28IH TDK [TDK Electronics], 73K224L-28IH Datasheet - Page 13

• Manufacturer Part Number: 73K224L-28IH
• Description: V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem
• Manufacturer: TDK [TDK Electronics]

Note: DTMF0 - DTMF2 should be set to an appropriate state after DTMF dialing to avoid unintended operation.
TONE REGISTER
BIT NO.
D3, D2,
D1, D0
D4
011
TR
OUTPUT
CONTR.
RXD
D7
TX DTMF
(Transmit
(continued)
DTMF 3,
DTMF)
NAME
2, 1, 0
TRANSMIT
GUARD
TONE
D6
TRANSMIT
ANSWER
CONDITION
TONE
D5
D4 = 1
0
1
TRANSMIT
DTMF
V.22bis/V.22/V.21/Bell 212A/Bell 103
D4
DESCRIPTION
Programs 1 of 16 DTMF tone pairs that will be transmitted
when TX DTMF and TX enable bit (CR0, bit D1) is set.
Tone encoding is shown below:
Disable DTMF.
Activate DTMF. The selected DTMF tones are transmitted
continuously when this bit is high. TX DTMF overrides all
other transmit functions.
EQUIVALENT
13
KEYBOARD
A
B
C
D
1
2
3
4
5
6
7
8
9
0
#
*
DTMF 3
D3
WIRE FDX
DTMF 2/4
D3 D2
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
DTMF CODE
D2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
Single-Chip Modem
D1 D0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
OVER- SPEED
EXTENDED
DTMF 1/
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
D1
LOW
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
73K224L
TONES
ANSWER
DTMF 0/
GUARD
HIGH
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
D0